393 lines
11 KiB
JavaScript
393 lines
11 KiB
JavaScript
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/**
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* The reveal.js markdown plugin. Handles parsing of
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* markdown inside of presentations as well as loading
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* of external markdown documents.
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*/
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(function( root, factory ) {
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if( typeof exports === 'object' ) {
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module.exports = factory( require( './marked' ) );
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}
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else {
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// Browser globals (root is window)
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root.RevealMarkdown = factory( root.marked );
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root.RevealMarkdown.initialize();
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}
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}( this, function( marked ) {
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if( typeof marked === 'undefined' ) {
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throw 'The reveal.js Markdown plugin requires marked to be loaded';
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}
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if( typeof hljs !== 'undefined' ) {
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marked.setOptions({
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highlight: function( lang, code ) {
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return hljs.highlightAuto( lang, code ).value;
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}
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});
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}
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var DEFAULT_SLIDE_SEPARATOR = '^\n---\n$',
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DEFAULT_NOTES_SEPARATOR = 'note:',
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DEFAULT_ELEMENT_ATTRIBUTES_SEPARATOR = '\\\.element\\\s*?(.+?)$',
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DEFAULT_SLIDE_ATTRIBUTES_SEPARATOR = '\\\.slide:\\\s*?(\\\S.+?)$';
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/**
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* Retrieves the markdown contents of a slide section
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* element. Normalizes leading tabs/whitespace.
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*/
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function getMarkdownFromSlide( section ) {
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var template = section.querySelector( 'script' );
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// strip leading whitespace so it isn't evaluated as code
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var text = ( template || section ).textContent;
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var leadingWs = text.match( /^\n?(\s*)/ )[1].length,
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leadingTabs = text.match( /^\n?(\t*)/ )[1].length;
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if( leadingTabs > 0 ) {
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text = text.replace( new RegExp('\\n?\\t{' + leadingTabs + '}','g'), '\n' );
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}
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else if( leadingWs > 1 ) {
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text = text.replace( new RegExp('\\n? {' + leadingWs + '}','g'), '\n' );
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}
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return text;
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}
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/**
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* Given a markdown slide section element, this will
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* return all arguments that aren't related to markdown
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* parsing. Used to forward any other user-defined arguments
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* to the output markdown slide.
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*/
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function getForwardedAttributes( section ) {
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var attributes = section.attributes;
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var result = [];
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for( var i = 0, len = attributes.length; i < len; i++ ) {
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var name = attributes[i].name,
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value = attributes[i].value;
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// disregard attributes that are used for markdown loading/parsing
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if( /data\-(markdown|separator|vertical|notes)/gi.test( name ) ) continue;
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if( value ) {
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result.push( name + '=' + value );
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}
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else {
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result.push( name );
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}
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}
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return result.join( ' ' );
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}
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/**
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* Inspects the given options and fills out default
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* values for what's not defined.
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*/
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function getSlidifyOptions( options ) {
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options = options || {};
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options.separator = options.separator || DEFAULT_SLIDE_SEPARATOR;
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options.notesSeparator = options.notesSeparator || DEFAULT_NOTES_SEPARATOR;
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options.attributes = options.attributes || '';
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return options;
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}
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/**
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* Helper function for constructing a markdown slide.
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*/
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function createMarkdownSlide( content, options ) {
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options = getSlidifyOptions( options );
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var notesMatch = content.split( new RegExp( options.notesSeparator, 'mgi' ) );
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if( notesMatch.length === 2 ) {
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content = notesMatch[0] + '<aside class="notes" data-markdown>' + notesMatch[1].trim() + '</aside>';
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}
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return '<script type="text/template">' + content + '</script>';
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}
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/**
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* Parses a data string into multiple slides based
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* on the passed in separator arguments.
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*/
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function slidify( markdown, options ) {
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options = getSlidifyOptions( options );
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var separatorRegex = new RegExp( options.separator + ( options.verticalSeparator ? '|' + options.verticalSeparator : '' ), 'mg' ),
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horizontalSeparatorRegex = new RegExp( options.separator );
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var matches,
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lastIndex = 0,
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isHorizontal,
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wasHorizontal = true,
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content,
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sectionStack = [];
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// iterate until all blocks between separators are stacked up
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while( matches = separatorRegex.exec( markdown ) ) {
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notes = null;
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// determine direction (horizontal by default)
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isHorizontal = horizontalSeparatorRegex.test( matches[0] );
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if( !isHorizontal && wasHorizontal ) {
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// create vertical stack
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sectionStack.push( [] );
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}
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// pluck slide content from markdown input
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content = markdown.substring( lastIndex, matches.index );
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if( isHorizontal && wasHorizontal ) {
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// add to horizontal stack
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sectionStack.push( content );
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}
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else {
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// add to vertical stack
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sectionStack[sectionStack.length-1].push( content );
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}
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lastIndex = separatorRegex.lastIndex;
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wasHorizontal = isHorizontal;
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}
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// add the remaining slide
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( wasHorizontal ? sectionStack : sectionStack[sectionStack.length-1] ).push( markdown.substring( lastIndex ) );
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var markdownSections = '';
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// flatten the hierarchical stack, and insert <section data-markdown> tags
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for( var i = 0, len = sectionStack.length; i < len; i++ ) {
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// vertical
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if( sectionStack[i] instanceof Array ) {
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markdownSections += '<section '+ options.attributes +'>';
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sectionStack[i].forEach( function( child ) {
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markdownSections += '<section data-markdown>' + createMarkdownSlide( child, options ) + '</section>';
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} );
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markdownSections += '</section>';
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}
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else {
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markdownSections += '<section '+ options.attributes +' data-markdown>' + createMarkdownSlide( sectionStack[i], options ) + '</section>';
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}
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}
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return markdownSections;
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}
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/**
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* Parses any current data-markdown slides, splits
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* multi-slide markdown into separate sections and
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* handles loading of external markdown.
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*/
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function processSlides() {
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var sections = document.querySelectorAll( '[data-markdown]'),
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section;
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for( var i = 0, len = sections.length; i < len; i++ ) {
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section = sections[i];
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if( section.getAttribute( 'data-markdown' ).length ) {
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var xhr = new XMLHttpRequest(),
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url = section.getAttribute( 'data-markdown' );
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datacharset = section.getAttribute( 'data-charset' );
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// see https://developer.mozilla.org/en-US/docs/Web/API/element.getAttribute#Notes
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if( datacharset != null && datacharset != '' ) {
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xhr.overrideMimeType( 'text/html; charset=' + datacharset );
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}
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xhr.onreadystatechange = function() {
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if( xhr.readyState === 4 ) {
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if ( xhr.status >= 200 && xhr.status < 300 ) {
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section.outerHTML = slidify( xhr.responseText, {
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separator: section.getAttribute( 'data-separator' ),
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verticalSeparator: section.getAttribute( 'data-vertical' ),
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notesSeparator: section.getAttribute( 'data-notes' ),
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attributes: getForwardedAttributes( section )
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});
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}
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else {
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section.outerHTML = '<section data-state="alert">' +
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'ERROR: The attempt to fetch ' + url + ' failed with HTTP status ' + xhr.status + '.' +
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'Check your browser\'s JavaScript console for more details.' +
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'<p>Remember that you need to serve the presentation HTML from a HTTP server.</p>' +
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'</section>';
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}
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}
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};
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xhr.open( 'GET', url, false );
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try {
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xhr.send();
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}
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catch ( e ) {
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alert( 'Failed to get the Markdown file ' + url + '. Make sure that the presentation and the file are served by a HTTP server and the file can be found there. ' + e );
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}
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}
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else if( section.getAttribute( 'data-separator' ) || section.getAttribute( 'data-vertical' ) || section.getAttribute( 'data-notes' ) ) {
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section.outerHTML = slidify( getMarkdownFromSlide( section ), {
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separator: section.getAttribute( 'data-separator' ),
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verticalSeparator: section.getAttribute( 'data-vertical' ),
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notesSeparator: section.getAttribute( 'data-notes' ),
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attributes: getForwardedAttributes( section )
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});
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}
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else {
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section.innerHTML = createMarkdownSlide( getMarkdownFromSlide( section ) );
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}
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}
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}
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/**
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* Check if a node value has the attributes pattern.
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* If yes, extract it and add that value as one or several attributes
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* the the terget element.
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*
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* You need Cache Killer on Chrome to see the effect on any FOM transformation
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* directly on refresh (F5)
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* http://stackoverflow.com/questions/5690269/disabling-chrome-cache-for-website-development/7000899#answer-11786277
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*/
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function addAttributeInElement( node, elementTarget, separator ) {
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var mardownClassesInElementsRegex = new RegExp( separator, 'mg' );
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var mardownClassRegex = new RegExp( "([^\"= ]+?)=\"([^\"=]+?)\"", 'mg' );
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var nodeValue = node.nodeValue;
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if( matches = mardownClassesInElementsRegex.exec( nodeValue ) ) {
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var classes = matches[1];
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nodeValue = nodeValue.substring( 0, matches.index ) + nodeValue.substring( mardownClassesInElementsRegex.lastIndex );
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node.nodeValue = nodeValue;
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while( matchesClass = mardownClassRegex.exec( classes ) ) {
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elementTarget.setAttribute( matchesClass[1], matchesClass[2] );
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}
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return true;
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}
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return false;
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}
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/**
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* Add attributes to the parent element of a text node,
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* or the element of an attribute node.
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*/
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function addAttributes( section, element, previousElement, separatorElementAttributes, separatorSectionAttributes ) {
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if ( element != null && element.childNodes != undefined && element.childNodes.length > 0 ) {
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previousParentElement = element;
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for( var i = 0; i < element.childNodes.length; i++ ) {
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childElement = element.childNodes[i];
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if ( i > 0 ) {
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j = i - 1;
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while ( j >= 0 ) {
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aPreviousChildElement = element.childNodes[j];
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if ( typeof aPreviousChildElement.setAttribute == 'function' && aPreviousChildElement.tagName != "BR" ) {
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previousParentElement = aPreviousChildElement;
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break;
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}
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j = j - 1;
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}
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}
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parentSection = section;
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if( childElement.nodeName == "section" ) {
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parentSection = childElement ;
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previousParentElement = childElement ;
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}
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if ( typeof childElement.setAttribute == 'function' || childElement.nodeType == Node.COMMENT_NODE ) {
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addAttributes( parentSection, childElement, previousParentElement, separatorElementAttributes, separatorSectionAttributes );
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}
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}
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}
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if ( element.nodeType == Node.COMMENT_NODE ) {
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if ( addAttributeInElement( element, previousElement, separatorElementAttributes ) == false ) {
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addAttributeInElement( element, section, separatorSectionAttributes );
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}
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}
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}
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/**
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* Converts any current data-markdown slides in the
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* DOM to HTML.
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*/
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function convertSlides() {
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var sections = document.querySelectorAll( '[data-markdown]');
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for( var i = 0, len = sections.length; i < len; i++ ) {
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var section = sections[i];
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// Only parse the same slide once
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if( !section.getAttribute( 'data-markdown-parsed' ) ) {
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section.setAttribute( 'data-markdown-parsed', true )
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var notes = section.querySelector( 'aside.notes' );
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var markdown = getMarkdownFromSlide( section );
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section.innerHTML = marked( markdown );
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addAttributes( section, section, null, section.getAttribute( 'data-element-attributes' ) ||
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section.parentNode.getAttribute( 'data-element-attributes' ) ||
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DEFAULT_ELEMENT_ATTRIBUTES_SEPARATOR,
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section.getAttribute( 'data-attributes' ) ||
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section.parentNode.getAttribute( 'data-attributes' ) ||
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DEFAULT_SLIDE_ATTRIBUTES_SEPARATOR);
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// If there were notes, we need to re-add them after
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// having overwritten the section's HTML
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if( notes ) {
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section.appendChild( notes );
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}
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}
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}
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}
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// API
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return {
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initialize: function() {
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processSlides();
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convertSlides();
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},
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// TODO: Do these belong in the API?
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processSlides: processSlides,
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convertSlides: convertSlides,
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slidify: slidify
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};
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}));
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